论文部分内容阅读
葛洲坝二江闸基存在软弱夹层,其渗流控制就不能按常规方法来设计。渗流控制设备既要降低渗透压力,又要保护闸下软弱夹层不受渗流侵害。本文从理论上分析论证排水孔群是满足这要求的有效的渗流控制设备。实施后,实地监测证明所提的以排渗为主的渗流控制措施是成功的。软弱夹层的渗透稳定问题是采用排渗设备必须解决的一个主要问题。而软弱夹层的渗透变形远不同于一般砂砾石的。本文阐述了夹层渗透变形的机理。软弱夹层的渗透变形除了流土、冲刷以及灌淤外,还有渗透劈裂。文中着重阐明夹层的渗透变形并不等于地基的渗透破坏。试验结果表明:葛洲坝这样的地基,其渗透系数在空间的分布是随机的,因此渗流场是一不稳定的随机场。
Gezhouba Erjiang gate there is weak interlayer, the seepage control can not be designed by conventional methods. Seepage control equipment not only to reduce the seepage pressure, but also to protect the flood under the weak interlayer from infiltration. This paper analyzes and studies the drainage hole group theoretically to be an effective seepage control equipment to meet this requirement. After the implementation, the on-site monitoring proved that the seepage-dominated seepage control measures mentioned were successful. The infiltration stability of the weak interlayer is one of the major issues that must be solved with the use of an infiltration device. The infiltration and deformation of weak interlayers are much different from those of gravel. This paper describes the mechanism of interlayer deformation. In addition to infiltration and deformation of weak intercalations, earthwaters, scour and siltation, as well as infiltration and splitting. It is emphasized in the paper that the infiltration deformation of the interlayer does not equal the infiltration and destruction of the foundation. The experimental results show that the distribution of permeability coefficient in Gezhouba is random in space, so the seepage field is an unstable random field.